add conversion from dandanplay

[ImpleLee]

According to API document from https://api.dandanplay.net/swagger/ui/index#!/Comment/Comment_GetAsync .

[m13253]

This project is already end-of-life. However, I will merge your changes as it may be useful to others. I won’t test whether the code has any bugs, nor will I provide any quality guarantees.

Thanks for your contribution anyway!